package io.bdmc.common.websocket;

import java.io.IOException;
import java.util.List;
import java.util.concurrent.CopyOnWriteArraySet;

import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import org.springframework.stereotype.Component;

import lombok.extern.slf4j.Slf4j;

@ServerEndpoint(value = "/websocket/{deptId}")
@Component
@Slf4j
public class MyWebSocket {
    // 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
    private static int onlineCount = 0;

    // concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    private static CopyOnWriteArraySet<MyWebSocket> webSocketSet = new CopyOnWriteArraySet<MyWebSocket>();

    // 与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;

    // 实际保存的用户登录名来区分是哪个部门
    private String deptId = "";

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(@PathParam(value = "deptId") String deptId, Session session) {
        this.session = session;
        this.deptId = deptId;
        webSocketSet.add(this); // 加入set中
        addOnlineCount(); // 在线数加1
        String msg = "deptId=" + deptId + "。加入！SessionId=" + session.getId() + "。当前在线人数为" + getOnlineCount();
        log.info("--------" + msg + "--------");
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this); // 从set中删除
        subOnlineCount(); // 在线数减1
        log.info("有一连接关闭！当前在线人数为" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        try {
            sendMessage("heartbeat");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 发生错误时调用
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }

    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
        // System.out.println("websocket:"+message);
        // this.session.getAsyncRemote().sendText(message);
    }

    /**
     * 群发自定义消息
     */
    public static void sendToAllClient(String message) throws IOException {
        for (MyWebSocket item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                continue;
            }
        }
    }

    /**
     * 给指定用户名发送消息
     */
    public static void sendInfo(String message, List<String> loginNames) throws IOException {
        for (MyWebSocket item : webSocketSet) {
            if (!loginNames.contains(item.deptId))
                continue;// 如果没有则继续循环
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                continue;
            }
        }
    }

    /**
     * 给指定用户名发送消息
     */
    public static void sendInfo(String message, String cascader) throws IOException {
        for (MyWebSocket item : webSocketSet) {
            String key = "," + item.deptId + ",";
            if (cascader.indexOf(key) != -1) {
                try {
                    item.sendMessage(message);
                } catch (IOException e) {
                    log.error(e.toString());
                }
            }
        }
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        MyWebSocket.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        MyWebSocket.onlineCount--;
    }
}